3-Bromopyridine-Heterogenized Phosphotungstic Acid for Efficient Trimerization of Biomass-Derived 5-Hydroxymethylfurfural with 2-Methylfuran to C₂₁ Fuel Precursor

Table 1

Acid density, pore size, and specific surface area comparison of 3-BrPyPW, HPyPW, and HPW.

Catalyst	Acid density (mmol/g)	Average pore size (nm)	(m^2/g)
3-BrPyPW	2.54	13.5	120.5
HPyPW	0.51	5.6	115.4
HPW	1.54	3.5	4.8