CAJ | 학술논문

以硅胶、氧化镁、椰壳活性炭和活性氧化铝为载体、以KOH为活性组分制得一系列新型负载型固体碱催化剂。考察了催化剂对超临界 CO2和 CH3OH 直接合成碳酸二甲酯反应的催化性能。结果表明：以椰壳活性炭为载体的KOH负载型催化剂的催化活性最高。采用比表面积测试(BET)、X-射线衍射(XRD)和扫描电镜(SEM)表征等手段对催化剂进行结构测试表明：椰壳活性炭的比表面积最大，能够很好地作为载体；负载的 KOH 经高温焙烧后分解为 K2O，提高了催化剂活化CO2的能力；负载后的催化剂表面晶型孔道尺寸变大，K2O在催化剂的表面及孔道内壁上分散较好。以KOH/C为催化剂，重点考察了KOH负载量、不同催化体系、反应温度和压力等对催化剂活性的影响；最后对反应过程进行了强化，获得了最佳条件下合成DMC的产率为8.5%，优于现有超临界非均相催化直接合成DMC的文献报道结果。
이규효、양화미、야각활성탄화활성양화려위재체、이KOH위활성조분제득일계렬신형부재형고체감최화제。고찰료최화제대초림계 CO2화 CH3OH 직접합성탄산이갑지반응적최화성능。결과표명：이야각활성탄위재체적KOH부재형최화제적최화활성최고。채용비표면적측시(BET)、X-사선연사(XRD)화소묘전경(SEM)표정등수단대최화제진행결구측시표명：야각활성탄적비표면적최대，능구흔호지작위재체；부재적 KOH 경고온배소후분해위 K2O，제고료최화제활화CO2적능력；부재후적최화제표면정형공도척촌변대，K2O재최화제적표면급공도내벽상분산교호。이KOH/C위최화제，중점고찰료KOH부재량、불동최화체계、반응온도화압력등대최화제활성적영향；최후대반응과정진행료강화，획득료최가조건하합성DMC적산솔위8.5%，우우현유초림계비균상최화직접합성DMC적문헌보도결과。
A series of solid base catalysts were prepared for the direct synthesis of dimethyl carbonate(DMC) using CO2 and CH3OH. These catalysts were prepared via an iso-volumic impregnation method using KOH as an active component which was supported by silica gel, magnesium oxide, activated carbon and alumina respectively. The experimental results show that the catalytic activity of the activated carbon supported KOH has the best performance. The catalysts were characterized by Brunauer-Emmett-Teller(BET), X-ray diffraction(XRD) and scanning electron microscope(SEM), and the experimental results show that the activated carbon with large specific surface area tends to be a good carrier. After high temperature calcination, KOH decomposes into K2O crystal which improves its catalytic activation. K2O disperses well on the surface and inner wall of the carriers. The effects of KOH loading amount, additive composition, reaction temperature and pressure were investigated and the reaction process was optimized. The yield of DMC is 8.5% under the optimum conditions, which is superior to the existing results of supercritical heterogeneous catalysis of DMC synthesis reported in the literature.