Synthesis of nano-Pt onto ceria support as catalyst for water–gas shift reaction by Reactive Spray Deposition Technology

• 1 wt% nano Pt on ceria was synthesized using RSDT for water–gas shift reaction.
• Catalyst was tested with 1 vol% CO, 3 vol% H2O in the range 100 °C–400 °C.
• No sintering or agglomerations of Pt nanoparticles was evident from HRTEM.
• Complete CO conversion was obtained at 250 °C at GHSV of 8622 h−1.
• RSDT prepared catalysts showed a 40% activity boost over conventionally prepared catalysts.

Reactive Spray Deposition Technology (RSDT) was employed to synthesize 1 wt% Pt of 0.5–2 nm onto ceria of 8–30 nm. The catalyst was evaluated for water–gas shift (WGS) reaction with 1 vol% CO & 3 vol% H2O, atmospheric pressure, temperature range (100–350 °C) and gas hourly space velocity (GHSV) of 8622 h−1. CO conversion of 15% (150 °C), 18% (200 °C), 37% (225 °C) and 100% (250 °C) was observed. Comparison with conventionally prepared catalysts (sol–gel, co–precipitation, and incipient wetness impregnation) from literature revealed superior activity with RSDT synthesized catalysts. Catalyst morphology was investigated with TGA, ICP–OES, XRD, TPR, HRTEM, and SEM with XEDS. No evidence of sintering or agglomeration of Pt nanoparticles was observed in HRTEM which could account for the dramatic improvement in activity.

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