Isobutane Dehydrogenation over Supported Platinum Acid–Base AlGaPON Catalysts

2001 ◽  
Vol 202 (1) ◽  
pp. 1-13 ◽  
Author(s):  
S Delsarte ◽  
F Maugé ◽  
P Grange
Keyword(s):  
Acid Base ◽  
Isobutane Dehydrogenation ◽  
Supported Platinum

Anti-coke behavior of an alumina nanosheet supported Pt–Sn catalyst for isobutane dehydrogenation

2021 ◽  
Author(s):  
Xin-Qian Gao ◽  
Wei Song ◽  
Wen-Cui Li ◽  
An-Hui Lu
Keyword(s):  
Isobutane Dehydrogenation ◽  
Supported Platinum ◽  
Defect Sites ◽  
Catalytic Reactivity

Alumina nanosheet supported platinum-based catalysts exhibited excellent catalytic reactivity and stability with an anti-coke capacity in the isobutane dehydrogenation process due to the abundant defect sites and decreased acidity.

Synergistic effect between Sn and K promoters on supported platinum catalyst for isobutane dehydrogenation

2011 ◽  
Vol 20 (6) ◽  
pp. 639-646 ◽  
Author(s):  
Yiwei Zhang ◽  
Yuming Zhou ◽  
Lihui Wan ◽  
Mengwei Xue ◽  
Yongzheng Duan ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Platinum Catalyst ◽  
Isobutane Dehydrogenation ◽  
Supported Platinum ◽  
Supported Platinum Catalyst

The role of acid-base sites in the preparation of Al2O3-supported platinum catalysts

1982 ◽  
Vol 6 (2) ◽  
pp. 177-182 ◽  
Author(s):  
S. Parkash ◽  
S.K. Chakrabartty ◽  
T. Koanigawa ◽  
N. Berkowitz
Keyword(s):  
Platinum Catalysts ◽  
Acid Base ◽  
Supported Platinum ◽  
Supported Platinum Catalysts

scholarly journals Development of approaches to the formation of platinum centers with given properties using carriers with a layered structure

2019 ◽  
Vol 62 (1-2) ◽  
pp. 24-38
Author(s):  
O. Belskaya ◽  
V. Likholobov
Keyword(s):  
Chemical Composition ◽  
Layered Double Hydroxides ◽  
Layered Structure ◽  
Active Component ◽  
Interlayer Space ◽  
Supported Catalysts ◽  
Acid Base ◽  
Cationic Composition ◽  
Supported Platinum ◽  
Double Hydroxides

Specific properties of layered double hydroxides (LDH), directions of their use as supports and supports precursors for catalysts synthesis and the advantages of such catalysts in reactions of various types are considered. The ability to vary LDH the chemical composition (cationic layers, interlayer space) without destroying the structure of the material makes it possible to regulate its adsorption and acid-base properties, selectively realize various mechanisms for fixing the precursor of the active component to obtain highly disperse and stable supported catalysts. Approaches to the formation of particles of supported platinum with desired properties through changes in the anionic and cationic composition of LDH, using as an example the system Pt/MgAl(M)-LDH are proposed.

Higher Dietary Acidity is Associated with Lower Bone Mineral Density in Postmenopausal Iranian Women, Independent of Dietary Calcium Intake

2014 ◽  
Vol 84 (3-4) ◽  
pp. 0206-0217 ◽  
Author(s):  
Seyedeh-Elaheh Shariati-Bafghi ◽  
Elaheh Nosrat-Mirshekarlou ◽  
Mohsen Karamati ◽  
Bahram Rashidkhani
Keyword(s):  
Calcium Intake ◽  
Dietary Calcium ◽  
Dietary Calcium Intake ◽  
Dietary Intakes ◽  
Iranian Women ◽  
Acid Base Balance ◽  
Mineral Density ◽  
Acid Base ◽  
Base Balance ◽  
Dietary Acid

Findings of studies on the link between dietary acid-base balance and bone mass are relatively mixed. We examined the association between dietary acid-base balance and bone mineral density (BMD) in a sample of Iranian women, hypothesizing that a higher dietary acidity would be inversely associated with BMD, even when dietary calcium intake is adequate. In this cross-sectional study, lumbar spine and femoral neck BMDs of 151 postmenopausal women aged 50 - 85 years were measured using dual-energy x-ray absorptiometry. Dietary intakes were assessed using a validated food frequency questionnaire. Renal net acid excretion (RNAE), an estimate of acid-base balance, was then calculated indirectly from the diet using the formulae of Remer (based on dietary intakes of protein, phosphorus, potassium, and magnesium; RNAERemer) and Frassetto (based on dietary intakes of protein and potassium; RNAEFrassetto), and was energy adjusted by the residual method. After adjusting for potential confounders, multivariable adjusted means of the lumbar spine BMD of women in the highest tertiles of RNAERemer and RNAEFrassetto were significantly lower than those in the lowest tertiles (for RNAERemer: mean difference -0.084 g/cm2; P=0.007 and for RNAEFrassetto: mean difference - 0.088 g/cm2; P=0.004). Similar results were observed in a subgroup analysis of subjects with dietary calcium intake of >800 mg/day. In conclusion, a higher RNAE (i. e. more dietary acidity), which is associated with greater intake of acid-generating foods and lower intake of alkali-generating foods, may be involved in deteriorating the bone health of postmenopausal Iranian women, even in the context of adequate dietary calcium intake.

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