Hydrogenolysis of alkanes: reactions of n-butane on Ru/zeolite catalysts

2017 ◽  
Vol 7 (22) ◽  
pp. 5294-5300 ◽  
Author(s):  
Geoffrey C. Bond ◽  
Juan J. Garcia
Keyword(s):  
Zeolite Catalysts ◽  
13X Zeolite ◽  
Increased Activity ◽  
Hydrogenolysis Of Alkanes

Ru/13X zeolite catalysts containing 0.6, 2 and 5.7% Ru prepared by reduction or decomposition of the hexammine complex are active and stable for n-butane hydrogenolysis between 400 and 460 K; oxidation leads to greatly increased activity.

Acetylene hydrochlorination over 13X zeolite catalysts at high temperature

2016 ◽  
Vol 18 (22) ◽  
pp. 5994-5998 ◽  
Author(s):  
Zhijia Song ◽  
Guangye Liu ◽  
Dawei He ◽  
Xiaodong Pang ◽  
Yansi Tong ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
High Temperatures ◽  
Zeolite Catalysts ◽  
High Catalytic Activity ◽  
Acetylene Hydrochlorination ◽  
13X Zeolite

13X zeolite exhibited high catalytic activity in acetylene hydrochlorination at high temperatures.

scholarly journals Comparative Study on the Catalytic Performance of a 13X Zeolite and its Dealuminated Derivative for Biodiesel Production

2021 ◽  
Vol 16 (4) ◽  
pp. 763-772
Author(s):  
Balqees A. Alshahidy ◽  
Ammar S. Abbas
Keyword(s):  
Oleic Acid ◽  
Batch Reactor ◽  
Acid Leaching ◽  
Catalytic Performance ◽  
Zeolite Catalysts ◽  
Biodiesel Production ◽  
Esterification Reaction ◽  
X Ray ◽  
13X Zeolite ◽  
Esterification Reactions

Natural kaolin clay was used to successfully prepare 13X zeolite catalysts, which were modified by dealumination with citric acid. Acid leaching eliminates impurities and aluminum, and improves the Si/Al ratio of the zeolite framework. The X-ray diffraction (XRD) patterns of both the original and modified 13X zeolites were the same, indicating that the crystalline frameworks were not destroyed during the dealumination process. X-ray fluorescence data of the dealuminated 13X zeolite showed an improved Si/Al ratio. Also, Atomic Force Microscopy (AFM) was used for the characterization of the catalysts. The catalytic performance of the original and modified catalysts was tested in the esterification reaction of oleic acid in a batch reactor. A higher conversion of oleic acid was obtained using the modified 13X zeolite. The resulting experimental data from the esterification reactions were fitted to the heterogeneous Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetic model to determine the rates of reaction. The results of the reaction kinetics showed an increase in the rate of reaction velocity and a distinct decrease in the activation energy when using the modified zeolite, indicating that employing the modified catalyst will give a higher conversion over a shorter time through a reaction with less sensitivity to temperature. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Advances in ultramicrotomy for physical sciences applications

1993 ◽  
Vol 51 ◽  
pp. 710-711
Author(s):  
G. McMahon ◽  
T. Malis
Keyword(s):  
Particle Surface ◽  
Zeolite Catalysts ◽  
Physical Sciences ◽  
Pull Out ◽  
Large Particles ◽  
Novel Applications ◽  
Metal Wires ◽  
Frequent Problem ◽  
Specific Orientation ◽  
Diamond Knife

As with all techniques which are relatively new and therefore underutilized, diamond knife sectioning in the physical sciences continues to see both developments of the technique and novel applications.Technique Developments Development of specific orientation/embedding procedures for small pieces of awkward shape is exemplified by the work of Bradley et al on large, rather fragile particles of nuclear waste glass. At the same time, the frequent problem of pullout with large particles can be reduced by roughening of the particle surface, and a proven methodology using a commercial coupling agent developed for glasses has been utilized with good results on large zeolite catalysts. The same principle (using acid etches) should work for ceramic fibres or metal wires which may only partially pull out but result in unacceptably thick sections. Researchers from the life sciences continue to develop aspects of embedding media which may be applicable to certain cases in the physical sciences.

Rhabdomyolysis in DOMS

1999 ◽  
Vol 38 (05) ◽  
pp. 164-168 ◽  
Author(s):  
Gloria Ruiz Hernandez ◽  
C. Sanchez Marchori ◽  
J. Munoz Moliner ◽  
C. Martinez Carsi
Keyword(s):  
Bone Scintigraphy ◽  
Previous History ◽  
Biochemical Studies ◽  
History Of ◽  
Increased Activity

SummaryA 26-year-old man with a previous history of external twin bursitis was remitted to our Department for a bone scintigraphy. Before the study, the patient performed an elevated number of intense sprints. Bone scintigraphy showed a bilaterally increased activity in both anterior rectum muscles suggesting rhabdomyolysis. Biochemical studies and MRT confirmed the diagnosis.

Increased Activity of Vitamin K-Dependent Clotting Factors in Human Hyperlipoproteinaemia – Association with Cholesterol and Triglyceride Levels

1977 ◽  
Vol 38 (02) ◽  
pp. 0465-0474 ◽  
Author(s):  
M Constantino ◽  
C Merskey ◽  
D. J Kudzma ◽  
M. B Zucker
Keyword(s):  
Vitamin K ◽  
Plasma Lipids ◽  
Coagulation Factors ◽  
Clotting Factor ◽  
Factor X ◽  
Clotting Factors ◽  
Blood Coagulation Factors ◽  
Cholesterol Levels ◽  
Type V ◽  
Increased Activity

SummaryLevels of blood coagulation factors, cholesterol and triglyceride were measured in human plasma. Prothrombin was significantly elevated in type Ha hyperlipidaemia; prothrombin and factors VII, IX and X in type lib; and prothrombin and factors VII and IX in type V. Multiple regression analysis showed significant correlation between the levels of these plasma lipids and the vitamin K-dependent clotting factors (prothrombin, factors VII, IX and X). Higher cholesterol levels were associated with higher levels of prothrombin and factor X while higher triglyceride levels were associated with higher levels of these as well as factors VII and IX. Prothrombin showed a significant cholesterol-triglyceride interaction in that higher cholesterol levels were associated with higher prothrombin levels at all levels of triglyceride, with the most marked effects in subjects with higher triglyceride levels. Higher prothrombin levels were noted in subjects with high or moderately elevated (but not low) cholesterol levels. Ultracentrifugation of plasma in a density of 1.21 showed activity for prothrombin and factors VII and X only in the lipoprotein-free subnatant fraction. Thus, a true increase in clotting factor protein was probably present. The significance of the correlation between levels of vitamin K-dependent clotting factors and plasma lipids remains to be determined.

PENERAPAN PENDEKATAN PEMBELAJARAN PAKEM DALAM MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA KELAS IV SDN 002 BAGAN BESAR

2017 ◽  
Vol 5 (3) ◽  
pp. 411
Author(s):  
Elvi Zahara
Keyword(s):  
Active Learning ◽  
Student Learning ◽  
Learning Outcomes ◽  
Mathematics Teaching ◽  
Mathematics Learning ◽  
Student Learning Outcomes ◽  
Average Value ◽  
Increased Activity

The background of this research is the lack of students' mathematics learning outcomes. Thelow yield caused by the learning of mathematics teaching is so very boring, monotonous,stressful and meaningless. Departing from the problems that occur in the field, especially ingrade IV SDN 002 Bagan Besar then there needs to be a strategy that can provide learningmathematics is expected to show active learning, creative, effective and fun. This research istindaan class (PTK), instrument collecting data observation and test learning outcomes. Theresults obtained: Increased activity of the students from the first cycle to the second cycle arevery significant. The increase in active learning, creative, and fun efekif the students alsofollowed by an increase in student learning outcomes. This is evidenced by the increase in thelearning outcomes of the first cycle to the second cycle. Namely, from the average value of 88,27 (cycle I) increased to an average value of 97, 59 (cycle II).

PENERAPAN MODEL PEMBELAJARAN ROLE PLAYING UNTUK MENINGKATKAN HASIL BELAJAR BAHASA INDONESIA SISWA KELAS V SDN 032 KUALU KECAMATAN TAMBANG

2017 ◽  
Vol 1 (1) ◽  
pp. 38
Author(s):  
Hasan Basri
Keyword(s):  
Learning Outcomes ◽  
Action Observation ◽  
Action Planning ◽  
Role Playing ◽  
Fifth Grade ◽  
Learning Models ◽  
Student Activity ◽  
Fifth Grade Students ◽  
Average Activity ◽  
Increased Activity

The problem in this research is found in Indonesian subjects that of the 30 students with KKM 75, which has already reached KKM as many as 15 people (41.7%), while that has not reached the KKM as many as 21 students (58.3%). The situation was caused by the teacher in explaining the lesson Indonesian still using a model of lectures and familiarize students to memorize, so that students can develop their ideas. The problems of this study as follows: Is the learning model application role playing can improve learning outcomes Indonesian fifth grade students of SDN 032 Kualu Kecamatan Tambang? This study aims to improve learning outcomes Indonesian grade students of SDN 032 Kualu Kecamatan Tambang through the application of learning models role playing. This research was conducted one month from the month of April 2015. The research was conducted 2 cycles, with each cycle consisting of two meetings as well as twice daily tests. Classroom action research in order to succeed, the researchers set the stage that action planning, action, observation and reflection. Based on the research results, it could be concluded that the activity of teachers in learning implementation role playing, in the first cycle average teacher activity amounted to 62.50% in the category of less pretty, and the activities of teachers in the second cycle of 84.72% in both categories once. Thus there is increased activity of teachers by 22.22% from the first cycle to the second cycle. The average activity of students in the first cycle the percentage of student activity in learning tends to increase. At the first meeting with the average student activity that is 61.25% with the category enough. At the second meeting increased by an average of student activity that is 81.25% with the category enough. The average increase in the activity of the students from the first cycle to the second cycle of 20.00%. The class classically considered complete when a class has achieved a score of 85% of the amount due or to KKM 75 then the class is said to be completed (90.00%). From the above shows that the application of learning models can improve outcomes role playing learning Indonesian grade students of SDN 032 Kualu Kecamatan Tambang, it can be concluded that the hypothesis is accepted as true action.

Sign in / Sign up

Export Citation Format

Share Document