Catalyst composition for selective hydrogenation with improved properties
A catalyst and selective technology, applied in the direction of hydrocarbons, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of expensive ionic liquids, reduced activity, and large additional costs. Achieve the effect of high selectivity, small loss and high "runaway" temperature
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Embodiment 1
[0077] Specimen A contains a BET surface area of 4.0m 2 0.017 wt% Pd on 1-2mm alumina spheres / g. To prepare sample A, 1100 g of α-alumina was added to 1075 mL of PdCl heated at 70 °C 2 solution (0.178 mg Pd / mL). After soaking the support in the solution for 1 hour, the solution was drained and the catalyst was washed 10 times with room temperature deionized water using a soak time of 5 minutes. After the final wash, the catalyst was calcined in air at 565° C. for 4 hours in a muffle furnace.
[0078] Sample A1 was prepared by adding 0.5% by weight of EMIM [EtSO 4 ] (1-Ethyl-3-methylimidazolium ethylsulfate) and prepared. To prepare Sample A1, Sample A (516.0 mg) was impregnated with 1-ethyl-3-methylimidazolium ethylsulfate aqueous solution (232 μL, 11.11 mg / mL) by incipient wetness. The catalyst was dried at 80 °C for 16 h and heated at 100 °C in 5% H 2 / N 2 Medium reduction for 1 hour.
[0079] Sample A2 was prepared by adding 0.5% by weight of BMIM[OTf] (1-butyl-3-...
Embodiment 2
[0101] Sample B1 was prepared by adding 0.001% by weight EMIM [EtSO 4 ] (1-Ethyl-3-methylimidazolium ethylsulfate) and prepared. To prepare Sample B1, Sample A (485.8 mg) was impregnated with an aqueous solution of 1-ethyl-3-methylimidazolium ethylsulfate (219 μL, 0.022 mg / mL) by incipient wetness. The catalyst was dried at 80 °C for 16 h and heated at 100 °C in 5% H 2 / N 2 Medium reduction for 1 hour.
[0102] Sample B2 was added by adding 0.007 wt% EMIM[EtSO 4 ] (1-Ethyl-3-methylimidazolium ethylsulfate) and prepared. To prepare sample B2, sample A (505.1 mg) was impregnated with an aqueous solution of 1-ethyl-3-methylimidazolium ethylsulfate (227 μL, 0.16 mg / mL) by incipient wetness. The catalyst was dried at 80 °C for 16 h and heated at 100 °C in 5% H 2 / N 2 Medium reduction for 1 hour.
[0103] Sample B3 was prepared by adding 0.025% by weight EMIM [EtSO 4] (1-Ethyl-3-methylimidazolium ethylsulfate) and prepared. To prepare sample B3, sample A (512.8 mg) was imp...
Embodiment 4
[0112] Sample A, Samples A1-A22, Samples B1-B6, and Control Samples C, C1, and C2 were tested in the as-prepared form in a microreactor test setup under typical front-end hydrogenation conditions . In the test, a simulated depropanizer feed containing 0.35 mol% acetylene, 15 mol% hydrogen, 0.02 mol% CO, 47 mol% ethylene, and balance nitrogen was fed at a total pressure of 478 psig (34 bar) and 7000 h -1 260 μL of the catalyst bed was passed at gas hourly space velocity (GHSV) while gradually increasing the bed temperature from about 45°C. The acetylene concentration at the reactor outlet was monitored by on-line gas chromatography (GC). The acetylene concentration at the reactor outlet continued to decrease with increasing temperature until it reached 2% due to increased non-selective reaction of hydrogen with ethylene. The temperature range between T1 and T2 is called the "operating window". The test results of Sample A, Samples A1-A22, Samples B1-B6 and Control Samples C,...
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