Conversion of Methanol to Olefins and Para-Xylene
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example 1
Selectivity of Steamed Conversion Catalyst
[0063]One benefit of steaming a conversion catalyst prior to use can be an improvement in the selectivity or yield of the desired products (aromatics, olefins) from the conversion reaction. When a conversion catalyst is newly synthesized or “fresh”, the catalyst may have a relatively high cracking activity due to the presence of additional acidic sites on the catalyst. Steaming the catalyst for a period of time prior to use in a conversion reaction can reduce the number of acidic sites, leading to increased production of desired products at the expense of side products such as carbon oxides and coke.
[0064]FIG. 2 shows results from conversion reactions performed on several catalysts with different amounts of initial steaming For the results shown in FIG. 2 (and also in FIGS. 3-5), the conversion reactions were performed to achieve 100% conversion of a methanol feed. The catalyst used for the conversion reactions in FIG. 2 was bound ZSM-5 cata...
example 2
Impact of Reaction Temperature with Steamed Catalysts
[0068]As shown above, steaming of a conversion catalyst can reduce or minimize the yield of side products, such as carbon oxides and coke, during a conversion reaction. The results shown in FIG. 2 corresponded to conversion reactions performed at 450° C. As the reaction temperature is increased, the benefits of using a steamed catalyst can increase.
[0069]FIG. 3 shows results from converting methanol to aromatics and olefins at reaction temperatures of 450° C., 500° C., and 550° C. using a catalyst corresponding to Catalyst A (fresh 1% Zn-ZSM-5) as described above. In FIG. 3, the results are displayed as a grouping of bar graphs for each product type, with the bars shown in the order 450° C.-500° C.-550° C., as indicated for the first data set (paraffins). The pressure during the conversion reactions was 15 psig and the WHSV was 2 hr−1. Again, the conversion reaction was performed to achieve 100% conversion of the methanol feed. As...
example 3
Modification with Phosphorus
[0073]In addition to the benefits provided by steaming a metal-modified conversion catalyst, phosphorus can also be added to the catalyst. FIG. 6 shows the average product distributions for performing a conversion reaction using a catalyst corresponding to Catalyst C (24 hours steamed 1% Zn-ZSM-5) and a catalyst that also included phosphorous (1% P and 1% Zn-ZSM-5), which can be referred to as Catalyst E. FIG. 6 shows results from performing conversion reactions using Catalyst C and Catalyst E at temperatures of 450° C. and 500° C., a pressure of 15 psig, and a WHSV of 2 hr−1 for the 1st Cycle. In FIG. 6, the results are displayed as a grouping of bar graphs for each product type, with the bars shown in the order C 450° C.-E 450° C.-C 500° C.-E 500° C., as indicated for the first data set (paraffins).
[0074]In FIG. 6, for Catalyst E, the carbon selectivity towards aromatics increased by 8% and ˜6% at 450° C. and 500° C., respectively. However, the olefins ...
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Abstract
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