Effect of precipitation medium on surface acidity and catalytic performance of chromium orthophosphates in cyclohexene skeletal isomerization and cumene conversion

1993 ◽  
Vol 3 (9) ◽  
pp. 975 ◽  
Author(s):  
Felipa M. Bautista ◽  
Juan M. Campelo ◽  
Angel Garcia ◽  
Diego Luna ◽  
Jose M. Marinas ◽  
...  
Keyword(s):  
Surface Acidity ◽  
Catalytic Performance ◽  
Skeletal Isomerization ◽  
Precipitation Medium ◽  
Cumene Conversion

scholarly journals CuZnZr-Zeolite Hybrid Grains for DME Synthesis: New Evidence on the Role of Metal-Acidic Features on the Methanol Conversion Step

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 671
Author(s):  
Massimo Migliori ◽  
Antonio Condello ◽  
Francesco Dalena ◽  
Enrico Catizzone ◽  
Girolamo Giordano
Keyword(s):  
Acid Catalyst ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Hybrid Catalyst ◽  
Zeolite Structure ◽  
Precipitation Medium ◽  
Co Precipitation ◽  
New Evidence

The assessment of the catalytic performance of “hybrid” metal/zeolite catalysts (based on FER or MFI structure and CuZnZr metal complexes) in the methanol dehydration step to DME has been studied in this work. The results clearly show that there is an important effect of the interaction between metal and acid sites affecting the acid catalyst performances. Additionally, deactivation, studied by means of a Timo-on-Stream (TOS) test, was affected by the type of zeolite structure used for hybrid catalyst preparation. The decrease in DME selectivity can be attributed to the cooperation of metal and acid sites in the production of different compounds (mainly methyl formate and dimethoxy methane) converting methanol and DME. The presence of these compounds (indicating different reaction pathways active) was found to be dependent on the zeolite structure and on the type of co-precipitation medium (water or ethanol) used to prepare the hybrid catalyst.

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
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