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[Display omitted] • Cu/FeO x catalysts were prepared by hydrothermal method companying with H 2 reduction. • Cu/FeO x was used to catalyze LTWGS and heavy crude oil cracking simultaneously. • Oxalic acid supplies in-situ H 2 for the heavy crude oil upgrading over Cu/FeO x. In this paper, Cu/FeO x composite catalysts were successfully synthesized by a hydrothermal method followed by a hydrogen gas reduction and were used as the catalysts for the cracking of heavy crude oil and the simultaneous low-temperature water–gas swift (LTWGS) reaction. Oxalic acid was used to generate the reactants (i.e., CO and H 2 O) of LTWGS reaction in-situ through its decomposition under the reaction temperature (200 ℃) of the heavy crude oil cracking. Cu0 in Cu/FeO x acted as a catalyst of the LTWGS reaction (CO + H 2 O ↔ CO 2 + H 2) and α-Fe 2 O 3 in Cu/FeO x acted as a catalyst for the cracking of heavy crude oil. In-situ H 2 coming from the LTWGS reaction promoted the catalytic viscosity reduction rate of heavy crude oil via inhibiting the radicals from recombining. This work gives a new, economical and efficient approach to supplying H 2 for heavy crude oil upgrading through the in-situ LTWGS reaction of the decomposition products of oxalic acid. [ABSTRACT FROM AUTHOR]

• CPF-1 is based on (Mo 6 O 20) n isopolyoxomolybdate chains bonded together with CuO 4 tetrahedra into a 3D inorganic polymer. • CPF-1 has high stability and excellent heterogeneous catalytic activity, the synthesis of alkynes into bromotriazole with ∼99 % yield. • The possible cascade catalytic mechanisms of the click and bromination reactions catalyzed by CPF-1 were also proposed. The selective conversion of alkynes into bromotriazoles over a single-component catalyst is highly desirable but presents significant challenges. In this study, we developed a robust copper-bonded polyoxomolybdates-based framework [Cu 2 (Mo 6 O 20)]·2H 2 O (CPF-1), and it integrates the catalytic ability of Cu(I) site with the multielectron-transfer ability of polyoxometalates. As a result, CPF-1 exhibits favorable bifunctional catalytic activity for click chemistry and achieves 99% yield in the conversion of corresponding products to bromotriazoles. To our knowledge, CPF-1 represents the first heterogeneous catalyst that significantly enhances cascade reaction with excellent efficiency and sustainable recyclability. Additionally, the possible cascade catalytic mechanisms of these two reactions are also proposed. The copper-bonded polyoxomolybdates-based framework (CPF-1) exhibits highly efficient heterogeneous catalytic activities in tandem click and bromination reactions (yields of up to 99 %). Furthermore, CPF-1 can be easily recovered and reused without significant loss of activity after seven reaction cycles. [Display omitted] [ABSTRACT FROM AUTHOR]