Vietnam Journal of Catalysis and Adsorption

RESEARCH PAPER

Corrected Proofs

Nghiên cứu ảnh hưởng của dạng ion bù trừ điện tích khung mạng đến khả năng giữ axit 12- phosphotungstic trên vật liệu Al-SBA-15 và ứng dụng làm xúc tác cho phản ứng tổng hợp chất tạo hương Fructon.
Study the effect of framework compensation ion type on 12-phosphotungstic acid immobilizability over Al-SBA-15 and its application in Fructone fragrancy synthesis

Do Van Cuong1, Truong Thi Hanh2, Do Ngoc Mai1, Nguyen Thi Nhiem1, Doan Thi Hai1, Le Thi Hoai Nam1 and Tran Quang Vinh1,3,This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Viện Hóa học, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 18 Hoàng Quốc Việt, Cầu Giấy, Hà Nội, Việt Nam
2 Đại học Hàng Hải Việt Nam, 484 Lạch Tray, Lê Chân, Hải Phòng, Việt Nam
3 Học viện Khoa học và Công nghệ, 18 Hoàng Quốc Việt, Cầu Giấy, Hà Nội, Việt Nam

ABSTRACT
12-phosphotungstic acid (HPA) heterogeneous catalyst was immobilized on Al-SBA-15 support over different compensation ions (NH4+ and Cs+) created by ion-exchange method. The presence, content of HPA and its effect on the support structure were characterized by EDX, FTIR, XRD, BET and TPD-NH3 methods. The results showed that HPA could be immobilized on Al-SBA-15 support up to 24.28 wt.% over NH4+ and 23.16 wt.% over Cs+. Both HPA/Al-SBA-15 catalysts showed very high acidity. By using Cs+, HPA could be immobilized better than by using NH4+ via the left HPA content inconsiderably decreased after five washing times with ethanol-water mixture. In Fructone synthesis, both catalysts showed high catalytic activity with high ethyl acetoacetate conversion. Moreover, HPA/Al-SBA-15 catalysts showed good catalytic stability after five reaction cycles with slightly decreasing of activity. Especially, the HPA/Al-SBA-15 in which HPA was immobilized over Cs+ ion showed better catalytic stability in comparison to that over NH4+ ion.

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Viện Kỹ thuật Hóa họcHội hóa học Việt NamTập đoàn Dầu khí Quốc gia Việt NamHội đồng chức danh Giáo sư Nhà nướcAmerican Chemical SocietyScienceDirectSpringerWiley Online LibraryOlympic Hóa học sinh viên Toàn quốc 2018