Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component
Reexamination Certificate
2007-07-03
2007-07-03
Wood, Elizabeth D. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And additional al or si containing component
C502S060000, C502S064000, C502S066000, C502S071000, C502S074000, C502S084000, C502S085000, C502S214000
Reexamination Certificate
active
10625322
ABSTRACT:
A method is disclosed for modifying a catalytic molecular sieve for shape-selective hydrocarbon conversions comprises:a) selectivating said catalytic molecular sieve by contacting with a silicon-containing selectivating agent; andb) calcining the selectivated catalytic molecular sieve at high temperature calcination conditions comprising temperatures greater than 700° C., which conditions are sufficient to reduce acid activity as measured by alpha value and increase diffusion barrier of said catalytic molecular sieve as measured by the rate of 2,3-dimethylbutane uptake, as compared to the selectivated catalyst. Catalytic molecular sieves thus prepared, such as silica-bound ZSM-5, and their use in hydrocarbon conversion processes such as aromatics isomerization, e.g., xylene isomerization, ethylbenzene conversion and aromatics disproportionation, e.g., toluene disproportionation are also disclosed.
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Beck Jeffrey S.
Borghard William G.
Chester Arthur W.
Kennedy Carrie L.
Stern David L.
ExxonMobil Chemical Patents Inc.
Feng Xiaobing
Wood Elizabeth D.
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