AlPO4–Al2O3catalysts with low alumina content. Part IV.—Effect of fluoride ion addition on texture, surface acidity and catalytic performance in cyclohexene and cumene conversions

1994 ◽  
Vol 90 (15) ◽  
pp. 2265-2275 ◽  
Author(s):  
J. M. Campelo ◽  
A. Garcia ◽  
D. Luna ◽  
J. M. Marinas ◽  
A. A. Romero ◽  
...  
Keyword(s):  
Surface Acidity ◽  
Catalytic Performance ◽  
Alumina Content ◽  
Fluoride Ion ◽  
Texture Surface ◽  
Content Part

scholarly journals Facile synthesis of CuMAl (M = Cr, Mn, Zn, and Co) with highly dispersed Cu and tailorable surface acidity for efficient 2-methylpyrazine synthesis

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 48662-48669 ◽  
Author(s):  
Jindou Hou ◽  
Wen. Luo ◽  
Shizhong Luo ◽  
Chao Lin ◽  
Ping Liu ◽  
...  
Keyword(s):  
Surface Acidity ◽  
High Surface ◽  
Catalytic Performance ◽  
Facile Synthesis ◽  
Highly Dispersed

Synthesis of 2-methylpyrazine requires the well-designed CuMAl catalysts with bifunctional sites. Through alternating M species (M = Cr, Mn, Zn, and Co), highly dispersed Cu0 and high surface acidity can be achieved, thereby approaching the optimized catalytic performance.

Production of Light Olefins Through Catalytic Cracking of C5 Raffinate Over Surface-Modified ZSM-5 Catalyst

2015 ◽  
Vol 15 (10) ◽  
pp. 8311-8317 ◽  
Author(s):  
Joongwon Lee ◽  
Seungwon Park ◽  
Ung Gi Hong ◽  
Jin Oh Jun ◽  
In Kyu Song
Keyword(s):  
Surface Modification ◽  
Catalytic Cracking ◽  
Surface Acidity ◽  
Catalytic Performance ◽  
Light Olefins ◽  
Light Olefin ◽  
Olefin Production ◽  
Chemical Liquid Deposition ◽  
Surface Modified ◽  
Teos Content

Surface modification of phosphorous-containing porous ZSM-5 catalyst (P/C-ZSM5-Sil.(X)) was carried out by a chemical liquid deposition (CLD) method using tetraethyl orthosilicate (TEOS) as a silylation agent. Different amount of TEOS (X = 5, 10, 20, and 30 wt%) was introduced into P/C-ZSM5il.(X) catalysts for surface modification. The catalysts were used for the production of light olefins (ethylene and propylene) through catalytic cracking of C5 raffinate. It was found that external surface acidity of P/C-ZSM5-Sil.(X) catalysts significantly decreased with increasing TEOS content. In the catalytic reaction, both conversion of C5 raffinate and yield for light olefins showed volcano-shaped curves with respect to TEOS content. Among the catalysts tested, P/C-ZSM5- Sil.(20) catalyst exhibited the best catalytic performance in terms of conversion of C5 raffinate and yield for light olefins. Thus, an optimal TEOS content was required for CLD treatment to maximize light olefin production in the catalytic cracking of C5 raffinate over P/C-ZSM5-Sil.(X) catalysts.

Molybdenum oxide modified HZSM-5 catalyst: Surface acidity and catalytic performance for the dehydration of aqueous ethanol

2011 ◽  
Vol 396 (1-2) ◽  
pp. 8-13 ◽  
Author(s):  
Yuwang Han ◽  
Cuiyun Lu ◽  
Dongsheng Xu ◽  
Yelong Zhang ◽  
Yi Hu ◽  
...  
Keyword(s):  
Molybdenum Oxide ◽  
Aqueous Ethanol ◽  
Catalyst Surface ◽  
Surface Acidity ◽  
Catalytic Performance

scholarly journals Effects of thermal treatment and fluoride ion doping on surface and catalytic properties of NiO–ZrO2 catalysts

2016 ◽  
Vol 34 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Reham M. Abdel Fattah ◽  
Hala A. Kiwan ◽  
Awad I. Ahmed ◽  
Mohamed R. Mostafa
Keyword(s):  
Thermal Treatment ◽  
Nickel Oxide ◽  
Surface Acidity ◽  
Nitrogen Adsorption ◽  
Impregnation Method ◽  
Fluoride Ions ◽  
Texture Surface ◽  
Pulse Technique ◽  
Ion Doping ◽  
Xrd Techniques

AbstractZrO2 and a series of NiO/ZrO2 hydrogels (5 to 25 wt.% NiO) were co-precipitated with the aid of NaOH–Na2C2O4 solution. Two fluorinated hydrogels were also prepared by wet impregnation method. The samples were calcined in the temperature range of 550 to 850 °C. The surface properties of the samples were determined using DTA, XRD and nitrogen adsorption at −196 °C. The conversion of isopropanol was tested using microcatalytic pulse technique. DTA measurements showed that the addition of nickel oxide to zirconia influences the phase transition of ZrO2. XRD revealed that the tetragonal phase was formed at T ⩽ 650 °C, while a biphasic mixture was obtained at T ⩾ 750 °C. No spinel structure was detected by both DTA and XRD techniques and only traces of cubic NiO were detected for the samples containing ⩾ 15 wt.% nickel oxide and calcined at T ⩾ 750 °C. Significant changes in texture, surface acidity and catalytic activity were found as a result of the effects of thermal treatment and chemical composition. Incorporation of fluoride ions greatly increased the surface acidity and consequently enhanced the dehydration activity. It has been found that dehydration activity is related to the amount of surface acidity while the dehydrogenation of this alcohol is sensitive to NiO content.

Structure, Texture, Surface Acidity, and Catalytic Activity of AlPO4–ZrO2(5–50 wt% ZrO2) Catalysts Prepared by a Sol–Gel Procedure

1998 ◽  
Vol 179 (2) ◽  
pp. 483-494 ◽  
Author(s):  
Felipa M. Bautista ◽  
Juan M. Campelo ◽  
Angel Garcia ◽  
Diego Luna ◽  
Jose M. Marinas ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Surface Acidity ◽  
Sol Gel ◽  
Texture Surface
Sign in / Sign up

Export Citation Format

Share Document