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Preparation and application of coconut shell activated carbon immobilized palladium complexes

机译：椰子壳激活的碳固定钯络合物的制备和应用

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Coconut shell activated carbon (CSAC) granules were used as carriers to immobilize palladium complexes. Boehm titration showed that the hydroxyl content of the carbon surface reached 0.376 mmol g~(-1) after 20% HNO3 treatment. Ethylenediamine, benzyl malononitrile and propyl malononitrile were successfully grafted onto the oxidized CSAC. The bidentate nitrogen ligands complexed Pd~(2+) samples were characterized by FT-IR, XPS, ICP and N2 adsorption-desorption. In oxidative carbonylation of phenol, three bidentate ligand grafted catalysts were evaluated in a high pressure reaction vessel. The results showed that the ethylenediamine grafted catalyst had a phenol conversion of 12.06% and a diphenyl carbonate (DPC) selectivity of 91.03%. In comparison, the benzyl malononitrile grafted catalyst displayed a phenol conversion of 12.00% and a DPC selectivity of 90.65%. The propyl malononitrile grafted catalyst displayed a phenol conversion of 6.22% and a DPC selectivity of 81.02%. Additionally, the ethylenediamine and the benzyl malononitrile grafted catalysts were also investigated in a continuous packed-bed reactor. The results showed that the phenol conversion and the DPC selectivity were comparative to those obtained in a high pressure reaction vessel.
机译：椰子壳活化碳（CSAC）颗粒用作固定钯络合物的载体。 BOEHM滴定表明20％HNO3处理后，碳表面的羟基含量达到0.376mmol g〜（-1）。乙二胺，苄基马诺硝硝基和丙基丙腈成功接枝到氧化的CSAC上。 BIDENATE氮配体复合Pd〜（2+）样品的特征是FT-IR，XPS，ICP和N2吸附 - 吸附。在苯酚的氧化羰基化中，在高压反应容器中评估了三个双齿配体移植催化剂。结果表明，乙二胺移植的催化剂的苯酚转化率为12.06％，碳酸二苯基（DPC）的选择性为91.03％。相比之下，苄基马诺硝基移植催化剂的苯酚转化率为12.00％，DPC的选择性为90.65％。丙基丙腈移植催化剂的苯酚转化率为6.22％，DPC选择性为81.02％。此外，还研究了连续填充的反应器中的乙二胺和苄基马诺硝基移植催化剂。结果表明，苯酚转化率和DPC的选择性与在高压反应容器中获得的苯酚转化性相比。

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